Just to be clear, the shifting is fine in any mode when the hybrid battery is fully charge? It only start happening when the battery is drained?
If this is the case then we would have to assume it related to the battery being drained.
https://www.2carpros.com/articles/hybrid-transmission
Clearly this is not common but as for the engine kicking in, that is simply a range extending device. It is not meant to recharge the battery just slow down how quickly it drains.
Are you able to recharge the battery to full capacity?
The only difference when shifting between these different modes is it is changing shift patterns and fuel strategy. So if this issue happens in these modes and starting to happen in normal mode then it is unlikely that this would be related to these modes but more related to the battery issue.
We can assume the transmission itself is okay if it shifts normally when the battery is charged so again it comes back to getting more info about the battery.
Let's start with this info and go from there. Thanks
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Wednesday, July 7th, 2021 AT 4:37 PM